Lawrence Linden, a pioneer in plastic card manufacturing and an expert in smart cards and other emerging technologies, died Oct. 28 of pancreatic cancer. He was 74 years old.

Until he formally retired in 1987, Mr. Linden was president for many years of Malco Plastics, a leading producer of credit and debit cards. He managed its transition to a new owner-Thorn EMI of Britain-and promoted the Malco-EMI Watermark Magnetics system as a way to shore up the security of cards' magnetic stripes.

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